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Authors
Abstract(s)
Este trabalho tem como objetivo principal investigar o comportamento de vigas de madeira submetidas à flexão em temperatura ambiente e também em condições térmicas variadas, para temperaturas constantes em toda a secção transversal e sob tempos de exposição ao fogo. As simulações numéricas foram realizadas com o uso do software Ansys em conformidade com as propriedades definidas para o material.
Foram desenvolvidos três modelos de cálculo numérico via elementos finitos, o primeiro realizando uma análise mecânica com carga incremental à temperatura ambiente, o segundo para análise mecânica com carga incremental em diferentes valores de temperatura constante e o terceiro para uma análise térmica de exposição à curva de incêndio ISO834 acoplada à análise mecânica com carga incremental.
Foi realizada uma simulação numérica de um ensaio experimental e as demais simulações contemplaram 2 geometrias de viga, cada uma delas analisadas em 6 valores de temperatura constante e 6 tempos de exposição diferentes. Para analises a respeito do máximo carregamento aplicado, do momento resistente, da espessura de carbonização e da taxa de carbonização, conforme necessário.
Os resultados obtidos numericamente foram comparados com o ensaio experimental fornecendo resultados coerentes, e com o método simplificado proposto pelo Eurocódigo 1995-1-2 que no geral mantém-se a favor da segurança ao determinar as propriedades de resistência da madeira por meio do método da secção reduzida.
The main objective of this work is to investigate the behavior of wooden beams submitted to bending for room temperature and also for varied thermal conditions, under constant temperatures across the entire cross section and under exposure to fire. The numerical simulations were performed using the Ansys software, in accordance with the proprieties defined of the material. Three numerical calculation models by finite elements were developed, the first performing a mechanical analysis with increment load at room temperature, the second for a mechanical analysis with an increment load at different values of constant temperature and the third for a thermal analysis of exposure to the curve of fire ISO834 coupled to mechanical analysis with incremental load. Was realized the numerical simulation of an experimental test, and the others for 2 beam geometries, each of which was analyzed at 6 constant temperature values and 6 different exposure times. Analyzes were made regarding the maximum applied load, the resistant moment, the carbonization thickness and the carbonization rate, as necessary. The results obtained numerically were compared with the experimental test providing coherent results, and with the simplified method proposed by Eurocode 1995-1-2 which in general remains in favor of safety when determining the strength properties of the wood through the method of reduced section.
The main objective of this work is to investigate the behavior of wooden beams submitted to bending for room temperature and also for varied thermal conditions, under constant temperatures across the entire cross section and under exposure to fire. The numerical simulations were performed using the Ansys software, in accordance with the proprieties defined of the material. Three numerical calculation models by finite elements were developed, the first performing a mechanical analysis with increment load at room temperature, the second for a mechanical analysis with an increment load at different values of constant temperature and the third for a thermal analysis of exposure to the curve of fire ISO834 coupled to mechanical analysis with incremental load. Was realized the numerical simulation of an experimental test, and the others for 2 beam geometries, each of which was analyzed at 6 constant temperature values and 6 different exposure times. Analyzes were made regarding the maximum applied load, the resistant moment, the carbonization thickness and the carbonization rate, as necessary. The results obtained numerically were compared with the experimental test providing coherent results, and with the simplified method proposed by Eurocode 1995-1-2 which in general remains in favor of safety when determining the strength properties of the wood through the method of reduced section.
Description
Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná
Keywords
Ansys Vigas de madeira Resistência ao fogo Comportamento térmico Simulações numéricas Elementos finitos